Add support for ubsan.

Rather than adding LOCAL_UB_SANITIZER, LOCAL_THREAD_SANITIZER, etc for
each new sanitizer, deprecate LOCAL_ADDRESS_SANITIZER in favor of
LOCAL_SANITZE that mirrors the behavior of -fsanitize=<sanitizers>.

For example, the following will use both asan and ubsan:

    LOCAL_SANITIZE := address undefined

We'll leave LOCAL_ADDRESS_SANITIZER around for compatibility until we
can clean up the tree.

Change-Id: I8a62315129d4753f8e992584ca6db1e5dfdd4d2a

core/clang/config.mk

@@ -115,7 +115,7 @@ endif
 
 # Address sanitizer clang config
 ADDRESS_SANITIZER_RUNTIME_LIBRARY := libclang_rt.asan_$(TARGET_ARCH)_android
-ADDRESS_SANITIZER_CONFIG_EXTRA_CFLAGS := -fsanitize=address -fno-omit-frame-pointer
+ADDRESS_SANITIZER_CONFIG_EXTRA_CFLAGS := -fno-omit-frame-pointer
 ADDRESS_SANITIZER_CONFIG_EXTRA_LDFLAGS := -Wl,-u,__asan_preinit
 
 ADDRESS_SANITIZER_CONFIG_EXTRA_SHARED_LIBRARIES := libdl $(ADDRESS_SANITIZER_RUNTIME_LIBRARY)

core/clear_vars.mk

@@ -173,6 +173,7 @@ LOCAL_CXX_STL := default
 LOCAL_NATIVE_COVERAGE :=
 LOCAL_DPI_VARIANTS:=
 LOCAL_DPI_FILE_STEM:=
+LOCAL_SANITIZE:=
 
 # arch specific variables
 LOCAL_SRC_FILES_$(TARGET_ARCH):=

core/config_sanitizers.mk

@@ -7,26 +7,62 @@ ifdef LOCAL_IS_HOST_MODULE
 ifeq ($(SANITIZE_HOST),true)
 ifneq ($(strip $(LOCAL_CLANG)),false)
 ifneq ($(strip $(LOCAL_ADDRESS_SANITIZER)),false)
-    LOCAL_ADDRESS_SANITIZER := true
+  LOCAL_SANITIZE := address
 endif
 endif
 endif
 endif
 
-# Configure address sanitizer.
+my_sanitize := $(LOCAL_SANITIZE)
+
+# Keep compatibility for LOCAL_ADDRESS_SANITIZER until all targets have moved to
+# `LOCAL_SANITIZE := address`.
 ifeq ($(strip $(LOCAL_ADDRESS_SANITIZER)),true)
+  my_sanitize += address
+endif
+
+# Don't apply sanitizers to NDK code.
+ifdef LOCAL_SDK_VERSION
+  my_sanitize :=
+endif
+
+unknown_sanitizers := $(filter-out address, \
+                      $(filter-out undefined,$(my_sanitize)))
+
+ifneq ($(unknown_sanitizers),)
+  $(error Unknown sanitizers: $(unknown_sanitizers))
+endif
+
+ifneq ($(my_sanitize),)
   my_clang := true
+
+  fsanitize_arg := $(subst $(space),$(comma),$(my_sanitize)),
+  my_cflags += -fsanitize=$(fsanitize_arg)
+
+  ifdef LOCAL_IS_HOST_MODULE
+    my_ldflags += -fsanitize=$(fsanitize_arg)
+  endif
+endif
+
+ifneq ($(filter address,$(my_sanitize)),)
   # Frame pointer based unwinder in ASan requires ARM frame setup.
   LOCAL_ARM_MODE := arm
   my_cflags += $(ADDRESS_SANITIZER_CONFIG_EXTRA_CFLAGS)
   my_ldflags += $(ADDRESS_SANITIZER_CONFIG_EXTRA_LDFLAGS)
   ifdef LOCAL_IS_HOST_MODULE
-      my_ldflags += -fsanitize=address
-      # -nodefaultlibs (provided with libc++) prevents the driver from linking
-      # libraries needed with -fsanitize=address. http://b/18650275
-      my_ldlibs += -ldl -lpthread
+    # -nodefaultlibs (provided with libc++) prevents the driver from linking
+    # libraries needed with -fsanitize=address. http://b/18650275 (WAI)
+    my_ldlibs += -ldl -lpthread
   else
-      my_shared_libraries += $(ADDRESS_SANITIZER_CONFIG_EXTRA_SHARED_LIBRARIES)
-      my_static_libraries += $(ADDRESS_SANITIZER_CONFIG_EXTRA_STATIC_LIBRARIES)
+    my_shared_libraries += $(ADDRESS_SANITIZER_CONFIG_EXTRA_SHARED_LIBRARIES)
+    my_static_libraries += $(ADDRESS_SANITIZER_CONFIG_EXTRA_STATIC_LIBRARIES)
+  endif
+endif
+
+ifneq ($(filter undefined,$(my_sanitize)),)
+  ifdef LOCAL_IS_HOST_MODULE
+    my_ldlibs += -ldl
+  else
+    $(error ubsan is not yet supported on the target)
   endif
 endif